Battery pack cooling line and battery pack cooling system

Abstract

The battery pack cooling pipeline and the battery pack cooling system are provided by the present disclosure, and the cooling pipeline comprises: a main pipeline comprising a water inlet pipeline and a water return pipeline; a plurality of branch pipelines comprising a plurality of water inlet branch pipelines and a plurality of water return branch pipelines; each water inlet branch pipeline extends towards a side away from the main pipeline; and each water return branch pipeline extends towards a side away from the main pipeline. Compared with the related art, the present disclosure adopts a total-branch structure to arrange the cooling pipeline, the water inlet pipeline and the water return pipeline are arranged in parallel, the water inlet branch pipelines are branched from the water inlet pipeline, and the water return branch pipelines are branched from the water return pipeline. After the cooling pipeline is applied to the battery pack cooling system, the water inlet pipeline and the water return pipeline are located in the middle of the battery module, and the water inlet branch pipeline and the water return branch pipeline are located in the gap space between the two battery modules, so that the gap space can be more flexibly utilized, the space occupation is reduced, and the problem of space waste that may occur in the traditional cooling pipeline arrangement is avoided.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a battery pack cooling pipeline and a battery pack cooling system. Background Technology

[0002] The battery pack cooling system for new energy vehicles is a key technology for stabilizing battery temperature, ensuring safety, and extending battery life. In related technologies, battery pack cooling systems use liquids such as ethylene glycol aqueous solutions as refrigerants, achieving efficient heat exchange through cooling plates, pipes, or immersion contact. This system includes components such as water pumps, cooling pipes, and radiators.

[0003] However, some battery packs have limited internal space and complex upper casing shapes, resulting in limited space for the cooling pipes of the battery pack cooling system. At the same time, to improve the energy density of the battery pack, the cooling pipes need to be as space-efficient as possible while still meeting performance requirements. Utility Model Content

[0004] The purpose of this disclosure is to provide a battery pack cooling pipeline and a battery pack cooling system to solve the problem of limited space for arranging battery pack cooling pipelines in the prior art.

[0005] In a first aspect, this disclosure provides a battery pack cooling pipeline for delivering refrigerant to multiple battery modules and for drawing out the refrigerant flowing through each of the battery modules. The cooling pipeline includes:

[0006] The main pipeline includes an inlet water pipeline and a return water pipeline, wherein the inlet water pipeline and the return water pipeline are arranged in parallel.

[0007] Multiple branch lines, including multiple inlet water lines and multiple return water lines;

[0008] in,

[0009] One end of each of the water inlet pipes is connected to the water inlet pipe, and the other end of each of the water inlet pipes is used to connect to each of the battery modules to deliver the refrigerant in the water inlet pipe to each of the battery modules. Each of the water inlet pipes extends toward the side away from the main pipeline.

[0010] One end of each of the return water pipes is connected to the return water pipe, and the other end of each of the return water pipes is used to connect to each of the battery modules to deliver the refrigerant flowing through each of the battery modules to the return water pipe. Each of the return water pipes extends toward the side away from the main pipeline.

[0011] In the battery pack cooling pipeline described above, preferably, the main pipeline is covered with a first fireproof sheath, and the branch pipelines are covered with a second fireproof sheath, wherein the thickness of the first fireproof sheath is greater than the thickness of the second fireproof sheath.

[0012] In the battery pack cooling pipeline described above, preferably, the thickness of the first fireproof sheath is in the range of 1.5mm to 2.5mm, and the thickness of the second fireproof sheath is in the range of 0.5mm to 1mm.

[0013] In the battery pack cooling pipeline described above, preferably, both the first fireproof sleeve and the second fireproof sleeve are made of ceramicized silicone rubber.

[0014] The battery pack cooling pipeline described above preferably further includes a sealing connection plate, wherein the sealing connection plate is provided with an inlet water pipeline external connection portion, an outlet water pipeline external connection portion, a fixed connection portion, and a sealing portion, wherein:

[0015] The external connection of the water inlet pipe is connected to the water inlet pipe to deliver refrigerant to the water inlet pipe;

[0016] The external connection of the return water pipe is connected to the return water pipe to draw out the refrigerant in the return water pipe;

[0017] The fixed connection part is used to connect the sealing connection plate to the preset surface;

[0018] The sealing part is located on the side of the sealing connection plate facing the preset surface. The sealing part includes a first sealing ring and a second sealing ring. The first sealing ring is arranged around the external connection part of the water inlet pipe and the external connection part of the water return pipe, and the second sealing ring is arranged around the fixed connection part.

[0019] In the battery pack cooling pipeline described above, preferably, each of the inlet water pipeline and the return water pipeline is provided with at least one four-way connector, and the four-way connector is connected to two of the inlet water pipelines or two of the return water pipelines.

[0020] In the battery pack cooling pipeline described above, preferably, the water inlet pipeline includes a plurality of sequentially connected water inlet branch pipes, and a first quick-connect plug is provided at the connection of adjacent water inlet branch pipes; the water return pipeline includes a plurality of sequentially connected water return branch pipes, and a second quick-connect plug is provided at the connection of adjacent water return branch pipes.

[0021] In the battery pack cooling pipeline described above, preferably, both the main pipeline and the branch pipelines are provided with corrugated sections.

[0022] In the battery pack cooling pipeline described above, preferably, the branch pipeline is provided with a flat tube section, and the corrugated tube section is provided at opposite ends of the flat tube section.

[0023] Secondly, this disclosure provides a battery pack cooling system, including the aforementioned battery pack cooling pipeline.

[0024] Compared with related technologies, this disclosure adopts a main-branch structure for the cooling pipeline, with the inlet and return water pipelines arranged in parallel. The inlet water pipeline branches off from the return water pipeline, and the return water pipeline branches off from the return water pipeline. After the cooling pipeline is applied to the battery pack cooling system, the inlet and return water pipelines are located in the middle of the battery module, and the inlet and return water pipelines are located in the gap space between the two battery modules. This allows for more flexible use of the gap space, reduces space occupation, and avoids the space waste problem that may occur in traditional cooling pipeline arrangements. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the cooling pipe layout provided in this disclosure.

[0026] Figure 2 yes Figure 1 The diagram shows the cooling pipes encased in a first fireproof sheath and a second fireproof sheath.

[0027] Figure 3 yes Figure 1 A perspective view of the sealing connection plate of the cooling pipeline shown.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10-Main pipe, 11-Inlet pipe, 12-Return pipe, 13-Four-way connector, 14-Inlet branch pipe, 15-First quick connector, 16-Return branch pipe, 17-Second quick connector, 18-Inlet quick connector, 19-Return quick connector.

[0030] 20 - Branch pipe, 21 - Inlet water pipe, 22 - Return water pipe, 23 - Corrugated pipe section, 24 - Flat pipe section;

[0031] 30 - First fireproof sleeve;

[0032] 40 - Second fireproof sleeve;

[0033] 50 - Sealing connection plate, 51 - External connection part of water inlet pipe, 52 - External connection part of water return pipe, 53 - Fixed connection part, 54 - Sealing part, 541 - First sealing ring, 542 - Second sealing ring. Detailed Implementation

[0034] The embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this disclosure, and should not be construed as limiting this disclosure.

[0035] Reference Figure 1 As shown, this disclosure provides a battery pack cooling pipeline for application in a battery pack cooling system. The battery pack contains multiple battery modules arranged sequentially at intervals, with gaps between adjacent battery modules. Each battery module has a liquid cooling channel, the distribution of which can refer to the distribution of battery modules in existing technologies and is not limited here. The cooling pipeline is used to deliver refrigerant to the liquid cooling channels of the multiple battery modules. After the refrigerant exchanges heat with the battery in the liquid cooling channels, the cooling pipeline then leads the refrigerant out, thereby preventing the battery pack from overheating and ensuring the reliability of the battery pack's operation.

[0036] In the embodiments provided in this disclosure, the cooling pipeline includes a main pipeline 10 and a plurality of branch pipelines 20. The main pipeline 10 includes an inlet pipeline 11 and a return pipeline 12. The inlet pipeline 11 and the return pipeline 12 are located in the middle of the battery module. The inlet pipeline 11 and the return pipeline 12 are arranged in parallel. The extension direction of the inlet pipeline 11 and the return pipeline 12 is approximately parallel to the distribution and arrangement direction of the battery module, making the overall structure of the main pipeline 10 more compact and reducing the space occupied by the battery pack.

[0037] The multiple sub-pipes 20 include multiple water inlet pipes 21 and multiple water return pipes 22. The number of water inlet pipes 21 and water return pipes 22 is related to the number of battery modules. Each battery module is provided with one water inlet pipe 21 and one water return pipe 22.

[0038] Each water inlet pipe 21 has one end connected to the water inlet pipe 11, and the other end connected to each battery module to deliver the refrigerant in the water inlet pipe 11 to the liquid cooling channels of each battery module. The water inlet pipe 11 centrally delivers the refrigerant, and each water inlet pipe 21, after branching off from the water inlet pipe 11, evenly distributes the refrigerant into the liquid cooling channels of each battery module. This ensures that the flow rate and temperature of the refrigerant are relatively uniform before entering the battery modules, avoiding localized overheating caused by uneven refrigerant distribution.

[0039] Each water inlet pipe 21 extends away from the main pipe 10. The water inlet pipe 21 extends from the center of the battery module towards its side, entering the gap between two adjacent battery modules until its end connects to the inlet of the corresponding battery module's liquid cooling channel. This fully utilizes the unused space between battery modules, avoids occupying other spaces within the battery pack, and further improves the battery pack's energy density.

[0040] One end of each return water pipe 22 is connected to the return water pipe 12, and the other end of each return water pipe 22 is used to connect to each battery module to deliver the refrigerant flowing through each battery module to the return water pipe 12. Each return water pipe 22 extends toward the side away from the main pipe 10.

[0041] The return water pipe 22 extends from the center of the battery module toward its side, and extends into the gap space between two adjacent battery modules until its end connects to the outlet of the liquid cooling channel of the corresponding battery module. This fully utilizes the unused space between the battery modules, avoids occupying other spaces within the battery pack, and further improves the energy density of the battery pack.

[0042] By adopting a main-branch structure for the cooling pipes, the inlet pipe 11 and the return pipe 12 are arranged in parallel. The inlet water pipe 21 branches off from the inlet pipe 11, and the return water pipe 22 branches off from the return water pipe 12. After the cooling pipes are applied to the battery pack cooling system, the inlet water pipe 11 and the return water pipe 12 are located in the middle of the battery module, and the inlet water pipe 21 and the return water pipe 22 are located in the gap space between the two battery modules. This allows for more flexible use of the gap space, reduces space occupation, and avoids the space waste problem that may occur in the traditional cooling pipe arrangement.

[0043] When severe gas generation occurs inside the battery module, the excessive pressure causes the explosion-proof valve on the battery casing to pop open, releasing gas, electrolyte, and metal shavings. To prevent damage to the cooling pipes from direct impact by high-temperature substances, the embodiments provided in this disclosure refer to... Figure 2 As shown, the main pipeline 10 is covered with a first fireproof sheath 30, and the branch pipeline 20 is covered with a second fireproof sheath 40. This protects the cooling pipeline from being burned through in the event of battery thermal runaway, ensuring the normal operation of the cooling system. Consequently, when battery thermal runaway occurs, the entire battery pack does not catch fire, and the fire spreads to adjacent battery cells.

[0044] Along the direction of gravity, the main pipeline 10 is located on the battery module. The first fireproof sleeve 30 directly covers the main pipeline 10 above the battery module, directly protecting the main pipeline 10 from the direct impact of high-temperature gas or liquid ejected when the battery explosion-proof valve inside the battery module is lifted. The branch pipeline 20 is located between two adjacent battery modules and does not directly face the impact in the event of battery runaway. Therefore, the branch pipeline 20 is covered with a second fireproof sleeve 40, which plays an auxiliary protection role.

[0045] Because the cooling pipes above the battery module are directly exposed to the potential risk of high-temperature splashes, the first fireproof sleeve 30 is thicker, limiting its thickness to be greater than that of the second fireproof sleeve 40. This allows the first fireproof sleeve 30 to provide stronger fire and heat insulation protection. Although the second fireproof sleeve 40 is thinner, its location relatively far from the direct risk area still provides sufficient protection, while reducing overall weight and cost.

[0046] In one feasible implementation, the thickness of the first fireproof sheath 30 ranges from 1.5mm to 2.5mm, preferably 2mm. A thickness of 1.5mm-2.5mm can effectively resist the direct impact of high-temperature gas or liquid that may be ejected when the explosion-proof valve of the battery in the battery module is opened. This provides sufficient heat insulation and fire protection, preventing damage to the cooling pipes under extreme conditions.

[0047] The thickness of the second fireproof sleeve 40 ranges from 0.5mm to 1mm, preferably 0.8mm. Although the thickness of 0.5mm-1mm is relatively thin, it still provides effective fire protection for the branch pipes 20 in areas not directly exposed. This further reduces the risk of the branch pipes 20 being splashed by high-temperature substances without significantly increasing weight and cost.

[0048] Preferably, both the first fireproof sleeve 30 and the second fireproof sleeve 40 are made of ceramicized silicone rubber. Ceramicized silicone rubber remains stable under high-temperature conditions and can form a ceramic-like protective layer at extreme temperatures, effectively blocking heat transfer. This significantly reduces the possibility of heat transfer from high-temperature areas to the cooling pipes, thereby protecting the cooling pipes from high-temperature shocks and ensuring that the battery pack cooling system can continue to operate during thermal runaway.

[0049] In the embodiments provided in this disclosure, reference is made to Figures 1 to 3 As shown, the battery pack cooling pipeline also includes a sealing connection plate 50 to connect the battery pack cooling pipeline to the battery pack cooling system. The sealing connection plate 50 is provided with an inlet water pipeline external connection part 51, an outlet water pipeline external connection part 52, a fixed connection part 53, and a sealing part 54, wherein:

[0050] The external connection part 51 of the water inlet pipe is connected to the water inlet pipe 11 to deliver refrigerant to the water inlet pipe 11. In one feasible embodiment, the end of the water inlet pipe 11 is provided with a quick-connect fitting 18. One end of the external connection part 51 of the water inlet pipe is inserted into the quick-connect fitting 18 at the end of the water inlet pipe 11, and the other end of the external connection part 51 of the water inlet pipe can be connected to a water pump. The water pump delivers refrigerant into the water inlet pipe 11 through the external connection part 51 of the water inlet pipe.

[0051] The return water pipe external connection 52 is connected to the return water pipe 12 to draw out the refrigerant in the return water pipe 12. In one feasible embodiment, the end of the return water pipe 12 is provided with a return water end quick connector 19. One end of the inlet water pipe external connection 51 is inserted into the return water end quick connector 19 at the end of the inlet water pipe 11. The other end of the inlet water pipe external connection 51 can be connected to the radiator. The radiator and the water pump are connected. The radiator cools the refrigerant at a higher temperature after heat exchange. Then the water pump delivers the cooled refrigerant back to the inlet water pipe 11, thereby forming a circulation.

[0052] Since the water inlet pipe 11 and the water return pipe 12 are arranged in parallel in the embodiments provided in this disclosure, the external connection part 51 of the water inlet pipe and the external connection part 52 of the water return pipe are also arranged in parallel on the sealing connection plate 50, and the two are relatively close to each other.

[0053] In the embodiments provided in this disclosure, a temperature sensor and / or a pressure sensor are further provided at the quick-connect fitting 18 at the water inlet and / or the quick-connect fitting 19 at the water outlet. The temperature sensor is used to detect the temperature information of the refrigerant in the pipeline, and the pressure sensor is used to detect the pressure information of the refrigerant in the pipeline. By monitoring the temperature and pressure in real time, the battery pack cooling system can adjust the refrigerant flow rate according to the actual needs of the battery pack, ensuring that the battery pack operates within a safe temperature and pressure range.

[0054] The fixing connection part 53 is used to connect the sealing connection plate 50 to a preset surface, which can be the surface of the battery pack housing, to ensure a stable connection between the cooling pipes and the battery pack and prevent loosening due to vibration or impact. In one feasible embodiment, the fixing connection part 53 is a connection hole provided on the sealing connection plate 50. The connection holes are distributed at the corners of the sealing connection plate 50. After the bolt passes through the connection hole, it is threaded and fitted onto the battery pack housing, thereby completing the detachable fixing of the sealing connection plate 50.

[0055] The sealing part 54 is located on the side of the sealing connecting plate 50 facing the preset surface. The sealing part 54 includes a first sealing ring 541 and a second sealing ring 542. When the sealing connecting plate 50 is fixed, a force is applied to the sealing connecting plate 50, so that the first sealing ring 541 and the second sealing ring 542 undergo elastic deformation and achieve a sealing effect with the battery pack shell.

[0056] The first sealing ring 541 is disposed around the external connection portion 51 of the inlet pipe and the external connection portion 52 of the return pipe, which can improve the sealing effect at the external connection portion 51 of the inlet pipe and the external connection portion 52 of the return pipe, preventing refrigerant from entering the battery pack from the edge gap of the external connection portion 51 of the inlet pipe and the external connection portion 52 of the return pipe, and ensuring the sealing performance of the refrigerant when entering and exiting the cooling pipes. In one feasible embodiment, the first sealing ring 541 includes multiple annular sealing protrusions, which are nested one another to form a multi-layer sealing structure. Even if one annular sealing protrusion has a minor leak, the other annular sealing protrusions can still provide sufficient sealing performance to ensure the reliability of the first sealing ring 541.

[0057] The second sealing ring 542 is provided around the fixed connection part 53, which can improve the connection sealing between the sealing connection plate 50 and the battery pack housing.

[0058] In one feasible battery module arrangement, the three battery modules in the front row are a single module to reduce costs and assembly complexity. Adjacent battery modules are connected in series. To avoid excessively long copper busbar spans between battery modules, the middle battery module in the front row is rotated 180 degrees, allowing the positive terminal to be next to the negative terminal and vice versa. Because the middle battery module is rotated 180 degrees, the inlet and outlet of the liquid cooling channels for the first two battery modules are adjacent, while the cooling pipes must avoid the copper busbars.

[0059] To accommodate the cooling piping in this configuration, the inlet pipe 11 is equipped with at least one four-way connector 13. This four-way connector 13 is positioned between the battery module rotated 180 degrees and the preceding battery module. The four-way connector 13 connects to two inlet water pipes 21, which simultaneously enter between the two battery modules. The two inlet water pipes 21 are constrained by straps to ensure the neatness and stability of the piping, while also preventing interference between the inlet water pipes 21 and the copper busbars. One inlet water pipe 21 connects to the liquid cooling channel of the preceding battery module, and the other inlet water pipe 21 connects to the liquid cooling channel of the following battery module. This allows the refrigerant to enter both battery modules simultaneously, improving the overall efficiency of the cooling system.

[0060] The return water pipe 12 is equipped with at least one four-way connector 13, which is positioned between the battery module rotated 180 degrees and the preceding battery module. The four-way connector 13 connects to two return water pipes 22, which simultaneously enter between the two battery modules. The two return water pipes 22 are constrained by straps to ensure the neatness and stability of the pipes and to prevent interference between the return water pipes 22 and the copper busbars. One return water pipe 22 connects to the liquid cooling channel of the preceding battery module, and the other return water pipe 22 connects to the liquid cooling channel of the following battery module. The refrigerant after heat exchange in both battery modules can flow out simultaneously, improving the overall efficiency of the cooling system.

[0061] Multiple T-joints are also provided on the inlet water pipe 11 and the return water pipe 12. The T-joints connect to a single inlet water pipe 21 or return water pipe 22. The inlet water pipe 21 or return water pipe can be expanded or adjusted as needed, which facilitates quick replacement or addition during subsequent upgrades or maintenance.

[0062] In the embodiments provided in this disclosure, the water inlet pipe 11 includes a plurality of sequentially connected water inlet branch pipes 14, and a first quick-connect plug 15 is provided at the connection point of adjacent water inlet branch pipes 14. By designing the water inlet pipe 11 into segments, it can be flexibly adjusted according to the specific layout and requirements of the battery pack, making it easy to adapt to battery modules of different shapes and sizes. The quick-connect connection is achieved at adjacent water inlet branch pipes 14 via the first quick-connect plug 15, making the connection and disassembly between adjacent water inlet branch pipes 14 more convenient and faster, while also ensuring a high degree of connection strength, effectively preventing loosening due to vibration or impact, and greatly improving the efficiency of installation and maintenance.

[0063] The return water pipeline 12 includes multiple sequentially connected return water branch pipes 16, with a second quick-connect plug 17 at the connection point of adjacent return water branch pipes 16. By segmenting the return water pipeline 12, it can be flexibly adjusted according to the specific layout and requirements of the battery pack, making it easy to adapt to battery modules of different shapes and sizes. The quick-connect plug 17 at the connection points of adjacent return water branch pipes 16 enables convenient and quick connection and disconnection, while also ensuring a high degree of connection strength, effectively preventing loosening due to vibration or impact, and significantly improving installation and maintenance efficiency.

[0064] In the embodiments provided in this disclosure, both the main pipeline 10 and the branch pipelines 20 are provided with corrugated sections 23. The corrugated sections 23 can absorb assembly tolerances, making the cooling pipeline easier to assemble. The main pipeline 10 and the branch pipelines 20 can be bent according to actual needs, allowing the cooling pipeline to better adapt to the limitations of the internal space of the battery pack, resulting in a more flexible layout and a more reasonable pipeline design.

[0065] Adjacent corrugated pipe sections 23 are connected by rigid pipes, which ensure the structural stability of the entire cooling piping system. The rigid pipes maintain the rigidity of the piping to a certain extent, preventing excessive deformation during use and thus ensuring the normal flow of refrigerant.

[0066] Furthermore, since the branch pipe 20 is located in the gap space between the two battery modules, and the width of this gap space is limited, a flat tube section 24 is provided on the branch pipe 20, and a corrugated tube section 23 is provided at opposite ends of the flat tube section 24. The shape of the flat tube section 24 can better adapt to the narrow space, reduce the impact on the battery module layout, and improve space utilization. The flat tube section 24 is also the aforementioned rigid tube. The combination of the rigid flat tube section 24 and the flexible corrugated tube section 23 ensures both the flexibility of the pipeline and the structural stability in the narrow space.

[0067] Secondly, this disclosure provides a battery pack cooling system, including the aforementioned battery pack cooling pipeline, and may also include components such as a water pump and a radiator.

[0068] The water pump is connected to the inlet pipe 11 through the external connection 51 of the inlet pipe, and supplies refrigerant to the battery pack cooling pipe. The refrigerant is distributed to the liquid cooling channels of each battery module through several inlet water pipes 21. After heat exchange in the liquid cooling channels of each battery module, the refrigerant is collected in the return water pipe 12 through various return water pipes 22. The refrigerant in the return water pipe 12 is connected to the radiator through the external connection 52 of the return water pipe. The radiator is connected to the water pump. The radiator cools the refrigerant at a higher temperature after heat exchange. Then the water pump delivers the cooled refrigerant back to the inlet pipe 11, thus forming a cycle.

[0069] The above description, based on the embodiments shown in the figures, details the structure, features, and effects of this disclosure. The above description is only a preferred embodiment of this disclosure, but this disclosure does not limit the scope of implementation to what is shown in the figures. Any changes made in accordance with the concept of this disclosure, or modifications to equivalent embodiments with equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of this disclosure.

Claims

1. A battery pack cooling pipeline for conveying refrigerant to multiple battery modules and for drawing out the refrigerant flowing through each of the battery modules, characterized in that, The cooling piping includes: The main pipeline includes an inlet water pipeline and a return water pipeline, wherein the inlet water pipeline and the return water pipeline are arranged in parallel. Multiple branch lines, including multiple inlet water lines and multiple return water lines; in, One end of each of the water inlet pipes is connected to the water inlet pipe, and the other end of each of the water inlet pipes is used to connect to each of the battery modules to deliver the refrigerant in the water inlet pipe to each of the battery modules. Each of the water inlet pipes extends toward the side away from the main pipeline. One end of each of the return water pipes is connected to the return water pipe, and the other end of each of the return water pipes is used to connect to each of the battery modules to deliver the refrigerant flowing through each of the battery modules to the return water pipe. Each of the return water pipes extends toward the side away from the main pipeline.

2. The battery pack cooling pipeline according to claim 1, characterized in that, The main pipeline is covered with a first fireproof sleeve, and the branch pipeline is covered with a second fireproof sleeve. The thickness of the first fireproof sleeve is greater than the thickness of the second fireproof sleeve.

3. The battery pack cooling pipeline according to claim 2, characterized in that, The thickness of the first fireproof sleeve ranges from 1.5mm to 2.5mm, and the thickness of the second fireproof sleeve ranges from 0.5mm to 1mm.

4. The battery pack cooling pipeline according to claim 2, characterized in that, Both the first and second fireproof sleeves are made of ceramicized silicone rubber.

5. The battery pack cooling pipeline according to claim 1, characterized in that, It also includes a sealing connection plate, which is provided with an external connection part for the water inlet pipe, an external connection part for the water return pipe, a fixed connection part, and a sealing part, wherein: The external connection of the water inlet pipe is connected to the water inlet pipe to deliver refrigerant to the water inlet pipe; The external connection of the return water pipe is connected to the return water pipe to draw out the refrigerant in the return water pipe; The fixed connection part is used to connect the sealing connection plate to the preset surface; The sealing part is located on the side of the sealing connection plate facing the preset surface. The sealing part includes a first sealing ring and a second sealing ring. The first sealing ring is arranged around the external connection part of the water inlet pipe and the external connection part of the water return pipe, and the second sealing ring is arranged around the fixed connection part.

6. The battery pack cooling pipeline according to claim 1, characterized in that, Each of the inlet water pipe and the return water pipe is provided with at least one four-way connector, and the four-way connector is connected to two of the inlet water pipes or two of the return water pipes.

7. The battery pack cooling pipeline according to claim 1, characterized in that, The water inlet pipeline includes multiple water inlet branch pipes connected in sequence, and a first quick-connect plug is provided at the connection of adjacent water inlet branch pipes; the water return pipeline includes multiple water return branch pipes connected in sequence, and a second quick-connect plug is provided at the connection of adjacent water return branch pipes.

8. The battery pack cooling pipeline according to claim 1, characterized in that, Both the main pipeline and the branch pipelines are equipped with corrugated pipe sections.

9. The battery pack cooling pipeline according to claim 8, characterized in that, The branch pipe is provided with a flat pipe section, and the corrugated pipe section is located at the opposite ends of the flat pipe section.

10. A battery pack cooling system, characterized in that, The battery pack cooling pipes include any one of claims 1 to 9.

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